Android: For most of us, data caps are our primary concern, but if you find yourself running out of voice minutes every month, Limit Your Call can automatically end calls for you or help you set time limits for your calls so you don't go over your allowance.

Limit Your Call is especially useful for families that share minutes or people with pre-paid phones. The app is free, and once installed allows you to set hard limits for your calls after which the app will disconnect you, or soft limits after which a notification will appear or the phone will vibrate. You can keep track of your time limit from the notifications bar, and cancel the limit at any time if the call is important, even if it's running long.